Question

The quantum numbers $+\frac{1}{2}$ and $-\frac{1}{2}$ for the electron spin represents:

• A. rotation of the electron in clockwise and anticlockwise direction respectively
• B. rotation of the electron in anticlockwise and clockwise direction respectively.
• C. magnetic moment of the electron pointing up and down respectively.
• D. two quantum mechanical spin states which have no classical analogue.

Answer 1

The correct option is A rotation of the electron in clockwise and anticlockwise direction respectively

Spin quantum Number (s): When an electron rotates around a nucleus it also spins about its axis. If the spin is clockwise, its spin quantum number is $+\frac{1}{2}$. If the spin is anti-clockwise, its value is $-\frac{1}{2}$.